What is the same about all the elements in a single group on the periodic table? The number of isotopes they form
The number of valence electrons in an atom
The number of core electrons in an atom
Their atomic mass

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i